What is BBL (Borough-Block-Lot)?
BBL stands for Borough-Block-Lot and is the primary identifier for real property in NYC. The format is:
- Borough (1 digit): 1=Manhattan, 2=Bronx, 3=Brooklyn, 4=Queens, 5=Staten Island
- Block (5 digits): A group of contiguous lots bounded by streets
- Lot (4 digits): An individual tax lot within the block
Example: 1-00835-0041 = Manhattan, Block 835, Lot 41 (the Empire State Building)
BBL is more reliable than street addresses for property research because addresses can be ambiguous (corner lots, buildings with multiple entrances), while BBL is unique and unambiguous.
You can find a property's BBL on tax bills, through DOF's property lookup, or by searching any address on RegWatch.
Frequently Asked Questions
What does BBL stand for?
BBL stands for Borough-Block-Lot — the unique 10-digit identifier assigned to every tax lot in NYC.
How do I find a property's BBL?
Check the property tax bill, search on DOF's website, or enter the address into RegWatch.
Why is BBL better than address for searches?
Addresses can be ambiguous (corner lots, multiple entrances), while BBL is unique and unambiguous for every tax lot.
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